Having trouble with SERIN command and MAX6675

[emerson]

Hello again. I'm trying to have a 16f630 receive serial data from a MAX6675. I read the SERIN section in the help topic but I still can't understand how to set it up. here are the datasheets for the chips and my code as well:

http://www.datasheetarchive.com/pdf-...-301/8892.html

http://pdf1.alldatasheet.com/datashe...IP/16F630.html

INCLUDE "modedefs.bas"

'Setup MAX6675 - Thermocouple
MAXData	var    porta.5   ' MAXpin7
MAXcs	var    porta.4	' MAXpin6
MAXClock  var    porta.2  ' MAXpin5

MAXResult var word
THC	var word	' degrees Celsius (* power of 10)
THF	var word    'stores degrees F

Main:

  low MAXcs	' select chip
  serin maxdata, N2400,maxclock, [MAXResult\16]	' get data
  high MAXcs	' start new data apture
   
THC= (MAXResult/32) ' Deg. C
THF= (((THC*18)/10)+32) 'Conversion to Deg. F

lcdout $fe, 1
lcdout "Temperature: ", dec THF, "F"] 'display temp. on LCD

pause 20 'give time between read cycles for MAX6675 to work right

goto Main

[mackrackit]

Wrong type of serial. This shows how to read it
http://www.picbasic.co.uk/forum/show...1178#post71178
And if you want degrees F add this bit
TempF = ABS(TempC) */ 461
TempF = TempF + 32

[emerson]

Wrong type of serial. This shows how to read it
http://www.picbasic.co.uk/forum/show...1178#post71178
And if you want degrees F add this bit
TempF = ABS(TempC) */ 461
TempF = TempF + 32

I tried the code and when I compile I get a "Invalid RAM location specified". How can I fix this?

Also, all I see on the LCD is a line of black boxes across the top row. Is this a timing problem?
The same circuit setup works with my other lcd program so I know it's not a wiring error.

I still need to change the ports...whoops

[mackrackit]

Normally black boxes are a contrast problem, but is the LCD cod is the same as on another project...

Post your whole current code and config setup so we can have a look.

[emerson]

Normally black boxes are a contrast problem, but is the LCD cod is the same as on another project...

Post your whole current code and config setup so we can have a look.

This is what I have so far:

 INCLUDE "modedefs.bas"

define    OSC 4

'Alias pins - MAX6675 temp sensor
MXSCLK  var     PORTA.5   'Clock
MXCS     var     PORTA.2    'Chip Select
MXSO     Var     PORTA.4   'Serial out

 'Allocate MAX6875 Variables
MXTemp   var     word    'raw data from 6675/type K sensor
TempC   var     word    'converted to degrees C


'-----------Read and display temperature from MAX6675-----------
MXCS = 0  'Chip select low
shiftin MXSO, MXSCLK, 0, [MXTemp\16]   'read the data to MXTemp
MXCS = 1    'Chip select high
TempC = MXtemp >> 5   'right shift the data 5 places to get degrees C (Read the Data sheet)
LCDOUT $fe,2,"Temp = ", DEC TempC, "degrees C "  ' Spit it out on an LCD

The contrast on the LCD is alright I have it adjusted properly. What does "Invalid RAM location specified" mean?

[mackrackit]

What does "Invalid RAM location specified" mean?

In this case it means you are compiling a LCDOUT command without having LCD defines.